Literary usage of Incredible

Below you will find example usage of this term as found in modern and/or classical literature:

1.The City of God by Augustine, Marcus Dods (1871)"credible, then this also is an incredible thing, that what is incredible should
have received such credit. Here then we have two incredibles,—to wit, ..."

2.Someone Comes to Town, Someone Leaves Town by Cory Doctorow (2005)""I mean, incredible. God, I haven't been to the movies in ten years at least.
So loud, Jesus, I've never heard anything like that. ..."

3.Journal by Royal Society of Arts (Great Britain) (1875)"Pit is almost incredible that up to this time the same course has not been taken
with houses. It is hard to understand why lightning conductors should be ..."

4.The History of the Decline and Fall of the Roman Empire by Edward Gibbon (1843)"... which were more feebly or less carefully guarded ; and with incredible diligence,
but by a different road, returned toward the mountains of Italy. ..."